Paris Hilton is speaking out about the grief she and her sister Nicky are dealing with following the loss of their life-long friend, Johnson and Johnson heiress, Casey Johnson.
Paris tells RadarOnline.com exclusively, "My sister Nicky and I are mourning the loss of our dear friend. Our hearts are broken. We feel we've lost a sister."
Nicky Hilton is the godmother to Casey Johnson's adopted daughter Ava. A source close to Casey told us, "Nicky is absolutely devastated by the loss of her best friend. Nicky is numb and very, very depressed.
“At the request of the Johnson family, Nicky hasn't spoken to the press, nor does she have any plans to do so."
As RadarOnline.com previously reported Casey was found dead at her West Hollywood home on Monday. Official cause of death has yet to be determined as the coroner is awaiting the results of toxicology tests before making his official ruling.
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Casey's funeral is scheduled to take place in New York City.